If Apple doesn't like it, they can just take their ball and go home. People will probably do just fine without them. If a huge need is felt for Apple to be back, then the law will change.
Yes by law I meant the DMA. You said in your comment that there is a need to differentiate between what Apple can do and what they should do and the author didn't mention specific DMA provisions to make his argument more concrete.
What I mean is that yes Apple is entitled to do whatever they want with their IP. But this entitlement is granted by the EU itself. EU may decide whatever they want and Apple can't really fight much against it. So instead of causing drama, it would be easier to just give up and exit EU.
At this point it is upto EU consumers to provide their opinions on what they want to happen next.
If you read my comment carefully, you'll see I explicitly mentioned the DMA near the end.